JAJSEX5B August   2010  – March 2018 LM3535

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      代表的なアプリケーション
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Charge Pump
      2. 8.3.2 Diode Current Sinks
      3. 8.3.3 Ambient Light Sensing (ALS) And Interrupt
      4. 8.3.4 Dynamic Backlight Control Input (PWM Pin)
      5. 8.3.5 LED Forward Voltage Monitoring
      6. 8.3.6 Configurable Gain Transition Delay
      7. 8.3.7 Hardware Enable (HWEN)
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown
      2. 8.4.2 Standby
      3. 8.4.3 Active Mode
    5. 8.5 Programming
      1. 8.5.1 I2C Compatible Interface
        1. 8.5.1.1 Data Validity
        2. 8.5.1.2 Start and Stop Conditions
        3. 8.5.1.3 Transferring Data
        4. 8.5.1.4 I2C Compatible Chip Address
        5. 8.5.1.5 Internal Registers of LM3535
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Ambient Light Sensing
          1. 9.2.2.1.1 Ambient Light Sensor Block
          2. 9.2.2.1.2 ALS Operation
            1. 9.2.2.1.2.1 ALS Configuration Example
          3. 9.2.2.1.3 ALS Averaging Time
          4. 9.2.2.1.4 Ambient Light Current Control + PWM
            1. 9.2.2.1.4.1 ALS + PWM Example
        2. 9.2.2.2 LED Configurations
        3. 9.2.2.3 Maximum Output Current, Maximum LED Voltage, Minimum Input Voltage
          1. 9.2.2.3.1 Total Output Current Capability
        4. 9.2.2.4 Parallel Connected and Unused Outputs
        5. 9.2.2.5 Power Efficiency
        6. 9.2.2.6 Power Dissipation
        7. 9.2.2.7 Thermal Protection
        8. 9.2.2.8 Capacitor Selection
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 ドキュメントの更新通知を受け取る方法
    2. 12.2 コミュニティ・リソース
    3. 12.3 商標
    4. 12.4 静電気放電に関する注意事項
    5. 12.5 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

9.2.2.1.1 Ambient Light Sensor Block

The LM3535 incorporates an ambient light sensing interface (ALS) which translates an analog output ambient light sensor to a user specified brightness level. The ambient light sensing circuit has 4 programmable boundaries (ZB0 – ZB3) which define 5 ambient brightness zones. Each ambient brightness zone corresponds to a programmable brightness threshold (Z0T – Z4T).

Furthermore, the ambient light sensing input features 15 internal software-selectable voltage setting resistors. This allows the LM3535 the capability of interfacing with a wide selection of ambient light sensors. Additionally, the ALS inputs can be configured as high impedance, thus providing for a true shutdown during low power modes. The ALS resistors are selectable through the ALS Resistor Select Register (see Table 2). Figure 30 shows a functional block diagram of the ambient light sensor input.

LM3535 30082442.gifFigure 30. Ambient Light Sensor Functional Block Diagram